CN101255697A - Deep building pit trussed-beam inner support integral application pre-stress method - Google Patents
Deep building pit trussed-beam inner support integral application pre-stress method Download PDFInfo
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- CN101255697A CN101255697A CNA2008100473029A CN200810047302A CN101255697A CN 101255697 A CN101255697 A CN 101255697A CN A2008100473029 A CNA2008100473029 A CN A2008100473029A CN 200810047302 A CN200810047302 A CN 200810047302A CN 101255697 A CN101255697 A CN 101255697A
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Abstract
The present invention relates to a method for wholly exerting pre-stress to the trussed internal bearing in the deep foundation pitch. The method comprises the following steps: installing an internal bearing which is composed of a principal top brace, a diagonal rod and a web rod or composed of a principal top brace and a web rod, and installing the trussed internal bearing between two pit walls of the deep foundation pitches; (2) installing a pre-stress force-transferring seat along the axial direction of the principal top brace on each principal top brace; (3) arranging a jack along the axial direction between two pre-stress force-transferring seats of each principal top brace; and (4) cutting off the principal top brace between two force-transferring seats of each principal top brace, exerting pre-stress with the jack, and when the pre-stress which should be exerted is obtained, reinforcing and welding the gap which is between the fracture surface of the cut principal top brace and is generated by exerting pre-stress with the steel material. The method has the advantages of quick installation, short time period for exerting pre-stress, being able to counteracting the compressing deformation of the member bar, and being able to quickly and effectively control the deformation in the deep foundation pitch.
Description
Technical field
The present invention relates to engineering fields such as civil construction, municipal administration, especially relate to deep building pit trussed-beam inner support integral application pre-stress method.
Background technology
At present, in deep foundation ditch supported design and the construction in, for single pole the single rod member of shoring under the deployment scenarios was applied prestressing force, and only single steel work was applied prestressing force to shoring, jack applies prestressed direction and to shoring center line of the bar point-blank, the single prestressing force that applies is less, and single pole is to supporting the foundation ditch that is suitable for foundation ditch width not wide (wide as the 20m left and right sides) in pushing up; But when the foundation ditch wider width, then can't adopt single rod member conduct to pushing up interior support, at this moment, in most cases, need to support in the truss-like, support in the truss-like that promptly supports in the truss-like that combines by main shore, brace and web member or combine by main shore and web member.Therefore, single rod member formula to shore the prestressing force that applies the prestressed method scope of application little (about foundation ditch width 20m), applies little, apply prestressing force to the influence basin little (being generally about 5～6m) of foundation ditch, to apply prestressed globality poor; Every rod member all need be installed jack, install trifling, installation is big; Can't apply prestressing force to supporting in the truss-like of deep foundation ditch.
Summary of the invention
The objective of the invention is in order to solve the deficiency that the above-mentioned background technology exists, proposition is applicable to deep building pit trussed-beam inner support integral application pre-stress method, make support in the truss-like have install jack quick, apply the advantage that the prestressed duration is short, can effectively control the distortion of deep foundation ditch fast.
For achieving the above object, the present invention adopts technical scheme to be: deep building pit trussed-beam inner support integral application pre-stress method, this method comprises the steps: that (1) installs in the truss-like of being made up of main shore, brace and web member in the truss-like that supports or is made up of main shore and web member and supports in deep foundation ditch, and is installed in the deep foundation ditch two and cheats between the walls supporting in the above-mentioned truss-like; (2) on every main shore, along the axial direction prestressed force-transmitting seat of main shore; (3) between two prestressing force force-transmitting seats of every main shore, jack is set in its axial direction; (4) cut off main shore between two force-transmitting seats of every main shore, apply prestressing force, after reaching the prestressing force that should apply, will weld with the steel reinforcing because of applying the slit that prestressing force produces between the main shore fracture that cut off with jack.
Above-mentioned steps (3) is described jack is set after, before step (4) is cut off every main shore, can utilize every main shore of jack pair to apply certain prestressing force earlier.Apply certain prestressing force earlier and can avoid the phenomenon of increase suddenly that after cutting off main shore, deforms.
Before in the described installation truss-like of above-mentioned steps (1), supporting, with every main shore on jack is installed the corresponding position, position the column that is fixed in the following stand column pile in deep foundation ditch bottom surface is set, upper end at column is provided with pallet, at each pallet place jig is set, step (4) to truss-like in support integral apply before the prestressing force, respectively the main shore at jack two ends is fixed on the pallet with this jig.
In such scheme, be supported in the described truss-like in support in the steel work, the interior support of reinforced concrete structure or the combining structure and support by steel work and reinforced concrete structure combination.
In such scheme, between two prestressing force force-transmitting seats of every main shore, at least two jack axially are set and apply prestressing force along it.
In such scheme, in deep foundation ditch, install when supporting in the truss-like, can bracket be set in the junction of main shore and Guan Liang or waist rail, bracket and Guan Liang or waist rail or the welding of foundation ditch vertical structure, the end of main shore is placed on respectively on this bracket, the end of main shore can keep the gap with Guan Liang or waist rail, when applying prestressing force, monitor the stressed size of each root brace and Guan Liang or waist rail contact site, then according to the stressed prison side result of brace, the opportunity of determining to close up the gap between main shore and Guan Liang or the waist rail.
Its difference of the present invention and background technology is:
1, background technology is to apply prestressing force on a rod member, finally has only a rod member to obtain prestressing force; It is reverse that power transmission direction when in the truss-like support integral applied prestressing force and tradition do not apply the power transmission process and the direction that support in the prestressed truss-like; Tradition does not apply the power transmission process and the direction that support in the prestressed truss-like: foundation ditch is to the hole internal strain, soil pressure is passed to power the rod member (four or six rods or seven rod members etc.) that supports in the truss-like that links to each other with Guan Liang or waist rail by vertical structure with Guan Liang or waist rail, by these four or six rods or seven rod members power is passed to two or many main shores at last, promptly give the minority rod member by many rod member power transmissions; The interior support integral of truss-like applies prestressed power transmission process and direction but is: jack is passed to two or many main shores with power, then by the rod member (four or six rods or seven rod members) that supports in two or many main shore power transmissions are given with Guan Liang or waist rail link to each other the truss-like, promptly apply prestressing force, and make many rod members obtain prestressing force to the minority rod member.
2, jack applies prestressed direction and center line of the bar direction on a line in the background technology; When utilizing the present invention to apply prestressing force to propping up a support integral in the truss-like, the power of being passed to the rod member that supports in the truss-like that links to each other with Guan Liang or waist rail (two straight supports and four rod members of two diagonal brace meters or two straight supports and four diagonal brace meter six rods or three directly support and seven rod members of four diagonal brace meters) by two or many main shores is uniform, promptly to pass to the power of these four rod members or six rods or seven rod members (comprise also can apply give stress to inclined member) be uniform for two or many main shores, should prison side point be set at these four rod members or six rods or seven rod members and Guan Liang or waist rail connecting place, so that in time adjust the method for attachment of the prestressing force that applies and two or many main shores and Guan Liang or waist rail and be connected degree; Two or many main shores and Guan Liang or waist rail be connected that special character is can be in the following ways: the junction at two or many main shores and Guan Liang or waist rail is provided with bracket, bracket and Guan Liang or waist rail or the welding of foundation ditch vertical structure, the end of two or many main shores is placed on respectively on this bracket, the end of two or many main shores can keep distance about 1cm with Guan Liang or waist rail, its objective is and to guarantee two or four stressed earlier and progressively increasings of inclined member when applying prestressing force, then according to the stressed prison side result's at these two or four inclined member places size, adjust the gap whether close up between two or many main shores and Guan Liang or the waist rail, solved support integral in the truss-like applied and guaranteed the stressed inhomogeneity problem of the straight-bar spare that supports in the truss-like and inclined member (two straight supports and four rod members of two diagonal brace meters or two straight supports and four diagonal brace meter six rods or three directly support and seven rod members of four diagonal brace meters) when giving stress, give stress by straight-bar spare is directly applied, make brace also can transmit prestressing force; It is not necessarily consistent with the center line of the bar direction to be that jack applies prestressed direction, existing direction unanimity also have direction inconsistent.
It is stressed big even surpass the situation of the two or many stressed design loads of main shore to take above-mentioned measure can adjust two or four braces stressed little and two or many main shores.
3, background technology can only apply prestressing force to the single rod member of steel work; Deep building pit trussed-beam inner support integral application pre-stress method not only comprises and steel structure truss Shi Neizhi support integral is applied prestressing force but also comprises to reinforced concrete structure or by a support integral in the combining structure truss-like of steel work and reinforced concrete structure combination and apply prestressing force.
Pallet is not set when 4, background technology applies prestressing force to the single rod member of steel work; Deep building pit trussed-beam inner support integral application pre-stress method should be provided with column and pallet at the position that applies the installed under prestressing jack, when applying prestressing force to propping up a support integral in the truss-like, for preventing to support upwards protuberance in the truss-like, the rod member that supports in each column pallet place reply truss-like is provided with jig, and jig is fixed on the pallet place;
5, background technology is not closed up this single rod member after the single rod member of steel work is applied prestressing force; Stressed very big because of supporting in the truss-like, main shore should adopt steel work to close up after applying prestressing force, should increase web member in case of necessity, is applying the two horizontal bars of prestressing force place employing.
The present invention has following advantage:
1, can integral body apply prestressing force to supporting in the truss-like, and support is applied widely in the truss-like, especially is applicable to large-scale or super-huge deep foundation ditch, the scope of application is big;
2, foundation ditch is applied prestressed influence basin big (20～35m is wide);
3, can effectively control the distortion of deep foundation ditch fast;
4, it is quick for installation to apply prestressed force-transmitting seat, and it is short to apply the prestressed duration;
5, cost is low;
6, the set-up time of support is long in the large-scale truss type, and trussed-beam inner support integral application pre-stress method can be offset the foundation ditch that has taken place in the installation process that supports in the truss-like and partly is out of shape;
7, the rod member that supports in the truss-like is very long, and the compressive strain of rod member self is big, and trussed-beam inner support integral application pre-stress method can be offset the compressive strain of rod member self, and is favourable with the safety of the construction of structures of periphery to foundation ditch;
8, by straight-bar spare is directly applied prestressing force, make inclined member also can transmit prestressing force, promptly to apply prestressed direction not necessarily consistent with the center line of the bar direction for jack, existing direction unanimity also have direction inconsistent;
9, not only can also can apply prestressing force to a support integral in the formula truss-like of top being applied prestressing force to a support integral in the truss-like in foundation ditch bight.
Description of drawings
Fig. 1 is the schematic diagram of embodiment 1.
Fig. 2 is embodiment 2 described columns, pallet and jig user mode figure.
Fig. 3 is the A-A sectional view of Fig. 2.
Fig. 4 is the schematic diagram of embodiment 3.
Fig. 5 is the schematic diagram of embodiment 4.
The specific embodiment
Embodiment 1: referring to Fig. 1.Present embodiment comprises the steps: that (1) install Guan Liang or waist rail 1 in deep foundation ditch, and main shore 2, brace 3 and web member 4 are installed, and forms in the truss-like and supports, and be installed between two relative in the deep foundation ditch hole walls supporting in the above-mentioned truss-like; (2) on every main shore 2, along the axial direction prestressed force-transmitting seat of main shore 2, this prestressing force force-transmitting seat is made of the bracket 8 and the stiffener 7 that are welded on main shore 2 both sides; (3) between the bracket 8 on every main shore 2 both sides, jack 5 or jack group are set along the axial direction of main shore, and apply certain prestressing force earlier and also can not apply prestressing force earlier, apply certain prestressing force earlier and can avoid the phenomenon that after cutting off main shore, deforms and increase suddenly; (4) the main shore 2 between every main shore both sides bracket 8 of cut-out, apply prestressing force with jack 5, after reaching the prestressing force that should apply, stablize a period of time, will weld because of applying the slit 6 usefulness steel plate reinforcements that prestressing force produces between the main shore 2 immediately then.Jack 5 or the jack group of also can not dismantling of can dismantling, interior support operational phase keeps jack 5 or jack group, can work the stressed effect of regulating.
Embodiment 2: referring to Fig. 1, Fig. 2 and Fig. 3.The step of present embodiment is substantially the same manner as Example 1, difference is, before must in the described installation truss-like of step (1) of embodiment 1, supporting for the bigger foundation ditch of span, with every main shore 2 on jack is installed the corresponding position, position the column 11 that is fixed in the following stand column pile in deep foundation ditch bottom surface is set, in the upper end of column 11 pallet 12 is set, pallet 12 welds with column 11, at each column pallet place jig 13 is set, a support integral applies before the prestressing force in 1 pair of truss-like of embodiment, respectively the main shore 2 at jack 5 two ends is fixed on the pallet 12 with this jig 13, to prevent supporting upwards protuberance in the truss-like.
Embodiment 3: referring to Fig. 1 and Fig. 4, present embodiment is to realize on the basis of embodiment 1 or embodiment 2, its step and embodiment 1 or embodiment 2 are basic identical, difference is, in above-mentioned two embodiment two or many main shores 2 are provided with bracket 9 with the junction of Guan Liang or waist rail 1, bracket 9 and Guan Liang or waist rail 1 or 14 welding of foundation ditch vertical structure, the end of two or many main shores 2 is placed on respectively on this bracket 9, and to keep gap 10 with Guan Liang or waist rail 1 be about 1cm, its objective is and to guarantee two or four stressed earlier and progressively increasings of brace 3 when applying prestressing force, then according to the stressed prison side result's at these two or four brace 3 places size, determine to close up the opportunity in gap between two or many main shores 2 and Guan Liang or the waist rail 1.
Embodiment 4: referring to Fig. 5, the step of present embodiment is substantially the same manner as Example 1, and difference is, applies prestressing force on the angle brace in deep foundation ditch bight.
Claims (6)
1, deep building pit trussed-beam inner support integral application pre-stress method, this method comprises the steps: that (1) installs in the truss-like of being made up of main shore, brace and web member in the truss-like that supports or is made up of main shore and web member and supports in deep foundation ditch, and is installed in the deep foundation ditch two and cheats between the walls supporting in the above-mentioned truss-like; (2) on every main shore, one stress force-transmitting seat is installed along the axial direction of main shore; (3) between two prestressing force force-transmitting seats of every main shore, jack is set in its axial direction; (4) cut off main shore between two force-transmitting seats of every main shore, apply prestressing force, after reaching the prestressing force that should apply, will weld with the steel reinforcing because of applying the slit that prestressing force produces between the main shore fracture that cut off with jack.
2, deep building pit trussed-beam inner support integral application pre-stress method according to claim 1, it is characterized in that step (3) is described jack is set after, before step (4) is cut off every main shore, utilize each rod member of jack pair to apply certain prestressing force earlier.
3, the method for a support integral stress application in the deep foundation ditch truss-like according to claim 1, before it is characterized in that in the described installation of step (1), supporting, with every main shore on jack is installed the corresponding position, position the column that is fixed in the following stand column pile in deep foundation ditch bottom surface is set, upper end at column is provided with pallet, at each pallet place jig is set, step (4) to truss-like in support integral apply before the prestressing force, respectively the main shore at jack two ends is fixed on the pallet with this jig.
4, deep building pit trussed-beam inner support integral application pre-stress method according to claim 1 is characterized in that being supported in the described truss-like in support in the steel work, the interior support of reinforced concrete structure or the combining structure by steel work and reinforced concrete structure combination and supports.
5, deep building pit trussed-beam inner support integral application pre-stress method according to claim 1 is characterized in that along it at least two jack being set axially between two stress force-transmitting seats of every main shore applies prestressing force.
6, according to the described deep building pit trussed-beam inner support integral application pre-stress method of arbitrary claim in the claim 1 to 5, it is characterized in that in deep foundation ditch, installing when supporting in the truss-like, the junction of main shore and Guan Liang or waist rail is provided with bracket, bracket and Guan Liang or waist rail or the welding of foundation ditch vertical structure, the end of main shore is placed on respectively on this bracket, the end of main shore and Guan Liang or waist rail keep the gap, when applying prestressing force, monitor the stressed size of each root brace and Guan Liang or waist rail contact site, then according to the stressed prison side result of brace, the opportunity of determining to close up gap between main shore and Guan Liang or the waist rail.
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| CN2008100473029A CN101255697B (en) | 2008-04-10 | 2008-04-10 | Deep building pit trussed-beam inner support integral application pre-stress method |
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| CN2008100473029A CN101255697B (en) | 2008-04-10 | 2008-04-10 | Deep building pit trussed-beam inner support integral application pre-stress method |
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| CN101255697B CN101255697B (en) | 2010-07-28 |
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| CN101725142B (en) * | 2009-11-19 | 2011-04-27 | 江苏扬建集团有限公司 | Method for applying prestressing force to deep foundation pit steel tube internal prop |
| CN102286980A (en) * | 2011-07-11 | 2011-12-21 | 福建工大建筑设计院 | Steel truss foundation pit supporting structure |
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| CN101255697B (en) | 2010-07-28 |
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